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The Humminbird 300 Series Sonar units are the "world's biggest compact fishfinder." A performer beyond its size, the Humminbird 300 Series gives wide coverage and the best picture possible.

Dual Beam PLUS: Get the best of both worlds, with selectable narrow and wide beams you can view individually, or melded into one display. Features precision, 20° beam that is optimized for excellent bottom detail, and reveals fish hidden in bottom clutter, along with wider, 60° beam provides greater coverage for fish and bait fish. Beams may be viewed separately, side by side, or blended together for the most complete picture. 1x bottom coverage allows you to find fish and structure in an area equal to your depth.

SwitchFire Sonar: Gives you the power to choose how returns are displayed. With two unique modes (Max mode & Clear Mode), you have complete control to adjust with the fishing conditions. Max mode provides incredible detail, allowing you to see the tiniest subsurface object - even thermoclines and water currents - for complete underwater coverage. Clear mode provides easy viewing in rough and shallow water. Time Variable Gain (TVG) software sifts through sonar returns to display only fish and structure.

Real Time Sonar: Updates instantly, so what you're seeing is what's below you...not what was below you ten seconds ago.

Sonar Echo Enhancement: Shows fish, bait, and more: even watch your vertical jigging on-screen. This is possible through advanced sonar processing and provides the details you want and need. It's important to know what depth the fish are located and equally important to be able to place your lure at that precise depth.

Side Imaging: (select models only) Offering amazingly clear, picture-like images of fish, the bottom and structure, it is the ultimate structure-finding tool. Its massive coverage - 480ft from side-to-side (240ft in each direction) - allows you to scan in mere minutes what used to take hours. Its high frequency sonar (not a camera) cuts through murk with crystal clarity.

Down Imaging: (select models only) Now you can see in stunning detail exactly what is happening below your boat. High-frequency sound waves emitted in razor thin slices allow you to see timber, brush, bridge pilings, rocks and all other types of structure like you never have before.

Precision 50-Channel GPS: (select models only) with built in UniMap cartography, which includes US coasts, lakes and rivers. It is also compatible with optional LakeMaster and Navionics cartography. Provides you with the ability to mark the location of structure anywhere on the sonar graph. Features a Trackplotting, Chartplotting, and GPS speed.